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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
CONSOLIDATED STATEMENTS OF EQUITY      
Reissuance of shares of common stock from treasury under Directors' Remuneration Plan   790 791
Issuance of shares of common stock upon exercise of stock options 51,602 85,500 4,375
Purchase of shares of common stock 5,470 1,331 2,981
Non-controlling interest in equity acquired, tax $ 2,280    
Other comprehensive income, tax $ 1,327 $ 1,236 $ 1,058